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Wow, what can I say. These came like-new and packaged perfectly from FlexPen76 with 100+ hours burn-in time. Compliments to him again =]
First Impression- The entire Sennheiser construction was very solid and the box was very attractive as representative of fine German engineering. I had no trouble ascertaining if the ones I got was real and at first I must say I was overwhelmed by all the...” --Sil3nce

“After reading glowing reviews of both of these in ear monitors I was still unable to decide which one would be right for me so I bought both, first the Shure and a few weeks later the Sennheiser. I already own the JH Audio 16 Pro, Ultimate Ears Triple.fi 10 Pro, HiFi Man HE-500, Sennheiser HD 650, Shure SRH940 among others. My music files are all in FLAC format and I play them through an...” --Art inTampa

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Upgraded from my CX-215's WHICH ARE ALSO AMAZING! But these kill it in audio replication.
I use these at work with my Sanza Fuze (Rockboxed and playing flac's) and it makes the day's fly by, My only complaint was at first finding the proper seal took a little work, also seemed to have a slight burn in period (which wasnt to bad) but when i first purchased the headphones I was...” --darkshyed

“These are normally over $400 on Amazon, where I got them for $100 "opened, but unused" with high expectations corresponding to the $400 price. They had all the tips, but with two mounted on the 'phones and four in the case; no grill cleaner. The problem I found, but which bothers me a lot, is that the highest notes on one of my favorite recordings, Philip Glass's Mishima soundtrack (which is...” --akgK340owner

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Like many other people, I got my cx300's as they were widely available on the high street with not much competition at the time. They are mostly known for their bass which is very abundant. The problem with that much emphasis on bass is the rest of the range suffers. Treble, in particular, suffers quite badly and is drowned out. Add to this very little clarity in the bass which doesn't have...” --Marcus_C

“I bought these on ebay.co.uk for £10.99 which is about $18 US or €13. They are a discontinued product, hence the low price, and bought from a retailer called "uk**seller". These are genuine Sennheiser products in sealed retail package, nicely made of good materials and fully up to the usual Sennheiser standards of presentation.
goldenears.net has tested the CX 280 (same IEM but with inline...” --julian67

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I bought these a few weeks ago, and like the other reviewer mentioned, they don't do anything too special. They are fairly detailed for an IEM at this level, and provide globs of bass. The inline iphone remote is especially nice. There is quite of bit of microphonics.
I will be keeping these as IEMs to use at the gym.
” --Bloodstriker

“Everybody knows Sennheiser. They are doing great job at delivering good sound for all prices. I am doing this review with price factor in thought.
First of all it is suprisingly detailed sounding headphone for me. I mean i am not audiophile or i didnt try much of audiophile gear but, they can race easily with px 100ii in terms of detail in my opinion.
It have a signature that bass is forward...” --Gonomon

“Build, look and comfort: These iems look very nice, has unique design. The earpieces seem built sturdily, the cable seems durable. These are so comfortable that you mayn't feel they're on your ears after wearing them for some times. I would appreciate flat cable like mh1c or xb series from Sony.
Sound: before burning in, there's a very noticeable hiss in the sound,...” --thesurvivor90